What I don't see is the same amount of fuss being made over this as when a protester hit a Congressman with loose spit in a say-it-don't-spray-it incident.

I guess the lesson we can draw from this is that political protesters have to hit elected officials on purpose to avoid public criticism.

No, of course I'm not serious. The lesson is that when liberals do things much worse that what conservatives have done they face far less consequences, and no interest groups or media outlets call upon liberal organizations to condemn them.